Honeycomb structure

Abstract

A pillar-shaped honeycomb structure, wherein a cell density based on a total number of a plurality of inlet cells and a plurality of outlet cells is 22 to 70 cells/cm2, wherein a thickness of each of partition walls is in a range of 0.15 mm or more and 0.38 mm or less, wherein an opening ratio at an inlet end surface is 44% or more, and wherein assuming a total surface area of all partition walls partitioning the plurality of inlet cells excluding the inlet cells adjacent to an outer peripheral side wall is S1, and a total surface area of all partition walls sandwiched between adjacent inlet cells among the plurality of inlet cells excluding the inlet cells adjacent to the outer peripheral side wall is S2, 33%≤S2/S1≤75% is satisfied.

1 . A pillar-shaped honeycomb structure, comprising:
 an outer peripheral side wall;   a plurality of inlet cells arranged on an inner peripheral side of the outer peripheral side wall, extending from an inlet end surface to an outlet end surface, having an opening at the inlet end surface, and having a sealing portion at the outlet end surface; and   a plurality of outlet cells arranged on the inner peripheral side of the outer peripheral side wall, extending from the inlet end surface to the outlet end surface, having a sealing portion at the inlet end surface, and having an opening at the outlet end surface;   wherein each of the plurality of inlet cells and the plurality of outlet cells is adjacent to at least one of the plurality of inlet cells and the plurality of outlet cells with each of partition walls interposed therebetween,   wherein a cell density based on a total number of the plurality of inlet cells and the plurality of outlet cells is 22 to 70 cells/cm 2 ,   wherein a thickness of each of the partition walls is in a range of 0.15 mm or more and 0.38 mm or less,   wherein an opening ratio at the inlet end surface is 44% or more, and   wherein assuming a total surface area of all the partition walls partitioning the plurality of inlet cells excluding the inlet cells adjacent to the outer peripheral side wall is S 1 , and a total surface area of all the partition walls sandwiched between adjacent inlet cells among the plurality of inlet cells excluding the inlet cells adjacent to the outer peripheral side wall is S 2 , 33%≤S 2 /S 1 ≤75% is satisfied.   
     
     
         2 . The honeycomb structure according to  claim 1 , wherein an opening area of each of the plurality of inlet cells are all the same except for those adjacent to the outer peripheral side wall. 
     
     
         3 . The honeycomb structure according to  claim 1 , wherein an opening area of each of the plurality of inlet cells and the plurality of outlet cells are all the same except for those adjacent to the outer peripheral side wall. 
     
     
         4 . The honeycomb structure according to  claim 1 , wherein an opening shape of each of the plurality of inlet cells is square except for those adjacent to the outer peripheral side wall. 
     
     
         5 . The honeycomb structure according to  claim 1 , wherein an opening shape of each of the plurality of inlet cells and the plurality of outlet cells is all square except for those adjacent to the outer peripheral side wall. 
     
     
         6 . The honeycomb structure according to  claim 1 , wherein an opening shape and an opening area of each of the plurality of inlet cells are all the same except for the one adjacent to the outer peripheral side wall. 
     
     
         7 . The honeycomb structure according to  claim 4 , wherein a length of one side of the square is 0.90 mm or more and 1.90 mm or less. 
     
     
         8 . The honeycomb structure according to  claim 5 , wherein a length of one side of the square is 0.90 mm or more and 1.90 mm or less. 
     
     
         9 . The honeycomb structure according to  claim 1 , wherein none of the plurality of outlet cells are adjacent to each other. 
     
     
         10 . The honeycomb structure according to  claim 1 , wherein the partition walls have an average linear expansion coefficient from room temperature to 800° C. in a direction in which the inlet cells and the outlet cells extend of 1.0×10 −6 /° C. or less. 
     
     
         11 . The honeycomb structure according to  claim 1 , wherein the partition walls comprise cordierite. 
     
     
         12 . The honeycomb structure according to  claim 1 , wherein the thickness of each of the partition walls is in a range of 0.18 mm or more and 0.30 mm or less. 
     
     
         13 . The honeycomb structure according to  claim 1 , wherein the cell density based on the total number of the plurality of inlet cells and the plurality of outlet cells is in a range of 26 to 62 cells/cm 2 . 
     
     
         14 . The honeycomb structure according to  claim 1 , wherein at least one of the plurality of inlet cells is not adjacent to any of the plurality of outlet cells. 
     
     
         15 . The honeycomb structure according to  claim 1 , wherein at least one of the plurality of outlet cells is adjacent to only an inlet cell. 
     
     
         16 . The honeycomb structure according to  claim 1 , wherein
 a ratio of a number of the plurality of inlet cells to a number of the plurality of outlet cells is 1.5 to 2.0, and the cell density based on the total number of the plurality of inlet cells and the plurality of outlet cells is in a range of 47 to 62 cells/cm 2 ; or   a ratio of a number of the plurality of inlet cells to the number of the plurality of outlet cells is 3.0 to 4.0, and the cell density based on the total number of the plurality of inlet cells and the plurality of outlet cells is in a range of 28 to 43 cells/cm 2 .